Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 07, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		$ 15,439	$ 14,742	$ 12,610
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Deferred tax benefit		(3,409)	395	(540)
Decrease (increase) in other assets, net		(2,208)	(1,061)	1,433
Increase (decrease) in other liabilities, net		(1,379)	138	475
Net cash provided by operating activities		26,904	19,807	14,801
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash used in investing activities		(119,225)	(182,256)	(176,106)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net of issuance expenses	$ 72,500
Common stock issued in connection with the exercise of stock options		1,534	117	190
Net cash provided by (used in) financing activities		148,304	196,615	17,570
NET INCREASE IN CASH AND CASH EQUIVALENTS		55,983	34,166	(143,735)
CASH AND CASH EQUIVALENTS:
Beginning of year		68,923	34,757	178,492
End of year		124,906	68,923	34,757
Green Bancorp, Inc.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		15,439	14,743	12,610
Adjustments to reconcile net income to net cash provided (used) by operating activities:
EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARY, Net of tax		17,995	15,957	13,253
Amortization of debt valuation allowance		105
Deferred tax benefit		(18)	17	14
Decrease (increase) in other assets, net		295	332	64
Increase (decrease) in other liabilities, net		146	34	9
Net cash provided by operating activities		(2,618)	(1,495)	(684)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital contributed to subsidiary			(67,508)
Net cash and cash equivalents paid in connection with acquisitions		2,740
Net cash used in investing activities		2,740	(67,508)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net of issuance expenses			72,591
Common stock issued in connection with the exercise of stock options		1,534	125	190
Net cash provided by (used in) financing activities		1,534	72,716	190
NET INCREASE IN CASH AND CASH EQUIVALENTS		1,656	3,713	(494)
CASH AND CASH EQUIVALENTS:
Beginning of year		8,666	4,953	5,447
End of year		$ 10,322	$ 8,666	$ 4,953